Automatic control for boiler-furnaces



L. S. POWELL.

AUTOMATIC CONT-80L FOR BOILER FURNACES.

APPLICATION FILED DEC. 17. 1917.

2 SHEETS-SHEET 1.

is i l i I Wl /itjjd f J/iaGEI-ZZZI .5 new .PawaZZ, zfm j, v I

L. S. POWELL.

AUTOMATIC CONTROL FOR BOILER F L JRNACEST 'APPLlCATlON FILEDDEC-17,1917.

1,370,765. Patented Mar. 8, 1921.

2 SHEETS-SHEET I Z! Fig. 1,

UNITED STATES PATENT OFFICE.

LYMAN S. POWELL, OF CHICAGO, ILLINOIS.

AUTOMATIC CONTROL FOR BOILER-FURNACES.

tiontherein' when the supply of Water to the boiler'is increased andvice versa.

The invention consists in the combinations and arrangements of partshereinafter described and claimed. 7

The invention will be best understood by reference to the accompanyingdrawings forming a part of this specification, and in which,

Figure 1 is a side view, shown partially in section, of aconstructionembodying my invention,

Fig. 2, a section taken on line 2-2 of Fig. 3, a section taken on line3-3, of Fig. 1, f

Fig. 4, a detail view illustrating a smoke stack damper and theconnectiontherewith, and, Fig. 5, a side View of a boiler furnaceequipped with the automatic control illustrated in Figs. 1, 2, 3 and 4.

The preferred form of construction, as illustrated in the drawings,comprises a fitting 5 adapted to be inserted in the boiler feed pipe andprovided centrally with a vertically arranged cylinder 6 open atone sideand bottom 7 to the incoming passage 8 of fitting 5. The other side ofcylinder 6 is provided with a vertical slot 9 permitting, when open,escape of water from cylinder 6 through the outlet passage 10 of thefitting 5. Cylinder 6 is provided with a removable lining 11 having aslot 12 registering with the slot 9 in said cylinder. 'A pistonY13operates in cylinder 6-11, a set screw 13 being provided in the bottomof fitting 5 to give free access to the incoming water to the bottom ofsaid piston at all times. The piston 13 is provided with a piston rod 14operating through an ordinary stufiing box '15 in the cylinder head 16,said cylinder head 16 being secured in position by means Specificationof Letters Patent.

Patented Mar. 8, 1921.

Application filed December 17, 1917. Serial No. 207,571.

of a number of stud bolts 17, whereby the angular position of saidcylinder head may be readily adjusted on said. cylinder. Two

upstanding guide rods 18 and 18 are secured to cylinder head 16 and areconnected at their upper ends by means of a yoke 19.

A weight 20 is adjustably secured to piston rod 14 and a cross head 21is also secured to said piston rod and given slidable bearings 21 on theguide rods 18 and 18. Cross head 21 is provided at one side with alaterally extending arm 22 connected with the upper end of a flexiblecable 23 which is secured to and wound upon a. grooved pulley 24E.Pulley 24- is rigidly fixed to a companion and larger pulley 25, both'of said pulleys being loosely mounted on ashaft 26 in a bracket 27adjustably mounted on guide rod 18 and secured in adjusted positions bymeans of set screws 28. A flexible cable 29 is secured to and wound uponpulley 25 in a direction opposite to the direction of winding of cable23 on pulley 24, the

upper end of cable 29 being secured to the lower end of a Weightedoperating arm 30 operating damper 31 in smoke stack 32 of theboiler-furnace.

By this arrangement, waterentering fitting 5 through the passage 8'willoperate upon the piston 13 to elevate the same, elevation of said pistonoperating through pulleys 24k and 25 and cables 23 and 29 to open damper31 to cause greater draft through the boiler-furnace, as will be readilyunderstood. Further increase of the supply of water passing throughfitting ,5 will elevate the piston 13 still farther, thus opening damper31 still farther to increase the draft to correspond, thus causing morerapid combustion in the boilerfurnace and consequently the applicationof greater heat to the boiler to correspondwith the'increased supply ofwater passing thereto. Upon decrease of the supply of water passingthrough fitting 5, the piston 13 descends to correspond effecting acorresponding adjustment of damper 31 to decrease the amount of heatsupplied to the boiler. By inserting different linings 11 with slots 12of different widths, the apparatus may be nicely adjusted to differentboiler conditions. By adjusting cylinder head 16 on the fitting 5 andbracket 27 on the guide rod-18 the apparatus may be readly' adjusted tomeet various conditions as to space and arrangements of parts.

Cross head 21 is also provided with a laterally extending arm 33connected with the upper end of a piston rod 34 of an ordinary dash pot35 mounted upon rod 18 by means of a bracket 36, said dash pot being anordinary type of dash pot and arranged to check sudden downwardmovements of piston rod 14 but to permit of free upward movementthereof, thus tending to prevent too sudden changes in the draft of theboiler-furnace.

While 'I have illustrated and described the preferred form ofconstruction for carrying my invention into effect, this is capable ofvariation and modification without departing from-the spirit'of theinvention. I, therefore, do not wish to be limited to the precisedetails of construction set forth, but desire to avail myself of suchvariations and modificationsas come within the scope of the appendedclaims.

'Having described my invention what I claim as newand desire to secureby Letters Patent is:

1. The combination with a boiler-furnace smoke stack damper, of afitting in the boiler feed pipe; a cylinder in said fitting in opencommunication with water flowing through said fitting, there being aslot in the wall of said cylinder; a piston in said cylinder; and anoperative connection betweensaid piston and said damper, substan-.tially as described.

2; The combination with a boiler-furnace smoke stack damper, of afitting in the boiler feed pipe; a cylinder in said fitting in opencommunication with water flowing through said fitting, there being aslot in the wall of said cylinder; a removablelining for said cylinderhaving a slot registering with said cylinder slot; a piston in saidcylinder; and an operative connection between said piston and saiddamper, substantially as described.

3. The combination with a boiler-furnace smoke stack damper, of afitting in the boiler feed pipe; a cylinder in said fitting in opencommunication with water flowing through said fitting, there being aslot in the wall of said cylinder; a pistonfin said cylinder; tworigidly connected pulleys; a

flexible element wound upon one of said pulleys and operativelyconnected with said piston; and a flexible element oppositely wound onthe other pulley and operatively connected with said damper,substantially as described.

' the'wall of said cylinder; a removable linmg for said cylinder havinga slot registering with said cylinder slot; a piston in said cylinder;two rigidly connected pulleys; a

flexible element wound upon one of said pulleysand operatively connectedw1th said piston; and. a flexible element opposltely wound on the otherpulley and operatively provided with a vertical slot to permit escape ofwater through the other side of said fitting; a piston'in said cylinder;and an operative connection between said piston and damper,substantially as described.

6. The combination with a boiler-furnace smoke stack. damper, of afitting in the boiler feed pipe; a vertically arranged cylinder in saidfitting, said cylinder being open at the bottom to permit entry of waterthereto from one side of said fitting andi provided with a vertical slottopermit escape of water through the other side of said fitting; apiston in said cylinder; two rigidly connected pulleys; a flexibleelement wound upon one of said pulleys and operatively connected withsaid piston; and a flexible element oppositely wound on the other pulleyand operatively connected with said damper, substantially as described.

7. The combination with a boiler-furnace smoke stack damper, of afitting in the boiler feed pipe; a vertically arranged cylinder in saidfitting, said cylinder being 7 open at the bottom to permit entry ofwater wound on the other pulley and operatively connected with saiddamper, substantially as described.

p 8. The combination with a boiler-furnace smoke stack damper, of afitting in the boiler feed pipe; avertically arranged 'cyl- 'inder' insaid fitting, said cylinder being open at the bottom to permit entry ofwater thereto from one side of said fitting and provided with a verticalslot to permit escape of water through the other side of said fitting; apiston-in said cylinder; a piston rod for said piston operating throughthe top of said fitting; a weight on said piston rod; two rigidlyconnected'pulleys; a flexible element wound upon one of said pulleysandoperatively connected'with said piston rod; a flexible elementoppositely wound on the other pulley and operatively connected with saiddamper; and a dash pot arranged to check downward movements of saidpiston rod, substantially as described.

9. A cylinder for an automatic control for boiler-furnaces provided withmeans at one end for permitting entry of water thereto and alongitudinal slot for permitting es 10 cape of water therefrom; and aremovable lining for said cylinder slotted to corre spond, substantiallyas described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

LYMAN s. POWELL.

Witnesses:

JOSHUA R. H. Po'r'rs, B. G. RICHARDS.

